Hover or tap underlined Spanish terms to see their translation and exam tip.
Navegando en un punto de sonda en la carta 6 metros y obteniendo del anuario de mareas la siguiente lectura: Hora de la pleamar 06:10, altura de la pleamar 5,65m. Hora de la bajamar 12:29, altura de la bajamar 2,15m. ¿Cuál de las siguientes respuestas más se aproxima a la sonda a las 09:09?Sailing at a point with a charted sounding of 6 metres, and reading from the tide tables: High water 06:10, height 5.65 m. Low water 12:29, height 2.15 m. Which answer is closest to the sounding at 09:09?
Show the answer
Correct answer: c) 10.05 metres.
Why it is correct
D = 6h 19m and t = 2h 59m. h = 3.90 + 1.75 × cos(85º) = 4.05 m. Sounding: 6 + 4.05 = 10.05 m.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- d) It does not match the working.
How to work it out in the exam
- Find t, the time since the first tide, and D, the duration between them.
- h = mean + (first − second) / 2 × cos(180º × t / D).
- Sounding = charted sounding + h.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · PY Test 1 · question 37 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · PY Test 2 · question 36 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.